Why buy a book on new tactics when the old ones work just fine?

Salesman: I’ve got this new title you might be interested in, since you deal with Plaintiff’s personal injury, it’s on how to deal with dishonest defense doctors.
Me: Does your book come with a 9mm pistol and a loaded magazine?
Salesman: No it does not...it comes with tips and tactics on how to deal with unscrupulous defense doctors.
Me: Is your book heavy?
Salesman: Uh. Yes. Why?
Me: Since you aren’t offering the handgun, I thought it might work if I threw it at one of these doctors.